/*
 *  Copyright 2001-2004 The Apache Software Foundation
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package ar.uba.fi.posgrado.academy.dao.impl;

import org.hibernate.Criteria;
import org.hibernate.Session;
import org.hibernate.criterion.Expression;
import org.springframework.dao.DataAccessException;
import org.springframework.orm.ObjectRetrievalFailureException;
import org.springframework.orm.hibernate3.HibernateCallback;

import ar.uba.fi.posgrado.academy.dao.BodyDAO;
import ar.uba.fi.posgrado.academy.model.Body;
import ar.uba.fi.posgrado.common.dao.AbstractDAO;
import ar.uba.fi.posgrado.common.dao.DAOException;
import ar.uba.fi.posgrado.common.dao.NoSuchEntityException;

public class BodyDAOImpl extends AbstractDAO<Body> implements BodyDAO {

	/**
	 * @see ar.uba.fi.posgrado.common.dao.AbstractDAO#getClazz()
	 */
	@SuppressWarnings("unchecked")
	@Override
	protected Class getClazz() {
		return Body.class;
	}

	public Body findByCode(final String code) throws NoSuchEntityException,
			DAOException {
		Body response = null;
		try {
			response = (Body) this.getHibernateTemplate().execute(
					new HibernateCallback() {
						public Object doInHibernate(Session session) {
							Criteria criteria = session
									.createCriteria(Body.class);
							criteria.add(Expression.eq("code", code));
							return criteria.uniqueResult();
						}

					});

			if (response == null) {
				// Necesario ya q el criteria no falla al no encontrar
				throw new NoSuchEntityException(
						"No existe intancia de Ente con codigo: " + code);
			}

		} catch (ObjectRetrievalFailureException e) {
			throw new NoSuchEntityException(
					"No existe intancia de Ente con codigo: " + code);
		} catch (DataAccessException e) {
			throw new DAOException("Excepcion al buscar una intancia de Ente "
					+ "con codigo: " + code + ". Mensaje: " + e.getMessage(), e);
		}

		return response;
	}

}
